Program UI looks interesting but
Regarding the introductory video..
Why are the drums mixed so far down in the demo mix? Loud guitars, quite drums... makes you wonder.
Why set up the drum kit in the middle of one of the world's premiere sound stages and then enclose the drum kit in acoustic baffles? makes no sense... that affects the room mics making them sound muffled and more remote.
And now - "We're recording in not only surround but height" - wow.
So now you can tell your mixing engineer (or have someone tell you) 'Hey can you make the drums sound taller?"
or maybe "can you make the kit sound like the listener is sitting the in nosebleed section of a concert? I always preferred the added vertical ambiance of the cheap seats.."
SD4 kits will add subfloor mic'ing techniques so that you can add depth to your drum mixes as well.
I think I'd be way more interested in a $99 upgrade path without the new sample content.